Electrically-operated centrifugal casting-machine



H. e. EYNON. ELECTRICALLY OPERATED CENTRIFUGAL CASTING MACHINE.

APPLICATION FILED OCT. 3, 1919.

I Patented July 26, 1921.

s SHEETSSHEET 1.

HHROLD G. E Y/VOM ATTORNEY.

. H. G. EYNON.

ELECTRICALLY OPERATED CENTRIFUGAL CASTING MACHINE. APPLICATION FILED 0cT.3, 1919.

1,885,78 1. Patented y 26, 1921.

6 SHEETS-SHEET 2.

. H. G. EYNON.

ELECTRICA LLY OPERATED CENTRIFUGAL CASTING MACHINE.

APPLICATION FILED OCT. 3, 1919.

1,385,781. Patented July 26, 1921.

, 6 SHEETS-SHEET 3.

mop/m.

I H a. wow. ELECTR-ICALLY OPERATED CENTHIFUGAL CASTING MACHINE.

APPLICATION FILED 0CT.3, I919 1,385,?81 Patelited July 26, 1921?,

e SHEETS-SHEET 4.

, H. G. EYNONE ELECTRICALLY OPERATED CENTRIFUGAL CASTING MACHINE.

APPLICATION FlLED OCT. 3,1918.

Patented July 26, 1921.

6 SHEETS-SHEET 5.

M mm TE ma -w 0 ATTORNEY H. G. EYNON.

ELECTRICALLY OPERATED CENTRIFUGAL CASTING MACHINE.

APPLICATIONJILED OCT. 3. 1919.

1 385,78 1 Patented July 26, 1921.

6 SHEETS'SHEET 6.

ATTO/P/VEX LYUNITED STAT-ES PATENTO E-I."

HAROLD e. E YNON, or rmmnnnrnm, PENNSYLVANIA.

ELECTBICALLY-OPERATED oENTRIrUGAL CASTING-MACHINE.

Specification of Letters Patent. Patentd J ly 26, 19 21 Application filed ctober 3, 1919. Serial No. 328,171.

. ToaZZ whom it may concern:

'Be it known that I, HAROLD G. Enron,

a citizen. of the United States, residing at 3211 N. Carlisle street, Philadelphia, in the county of Philadelphiaand State of Pennsylvania, have invented a certain new and useful Electrically-Operated Centrifugal -('3'asting-Machine, of which the following is a specification. n My invention relates to a casting machine for distributing molten metal within the mold by centrifugal force. I

'The purpose of my invention is to rotate the rotor (mold) of the casting machine by electromagnetic action, preferably to form the rotor as one of the parts-armature or field-of an electric motor, and surround it by a stator forming the cooperating motor member with the resultthat the mold is rotated electrically.

A further purpose is to supply a part, at least of the heat of the rotor centrifugally by electrical means in order to prepare 1mtially for the casting, and maintain uniform heating conditions and avoid undue chilling during continued casting operations.

A further purpose isto form the end of the mold separable, from its body so that the v roasting can be withdrawn without stopp ng the rotor, providing for stopping rotatlon of the end during this removal of the casting and for rotating the endpi eliminary to its replacement against the body.

A further purpose is to rotate the rotor about a vertical axis, so that the end becomes the bottom and,-preferably, to suppl separate rotating means for the bottom-t ereof, permitting removal of the bottom and of the casting wholly or partially by gravity during rotation of the body, to permit the casting to be withdrawn without stopping the rotor.

A further purpose is to supply a part of I the lift of a removable bottom of the rotor by electromagnetic action and preliminarily to-rotate the bottom electromagnetically so I that it can be closed against the rotor with- I out stopping the rotor and wlthout rotary friction thereagainst.

A further purpose is to' provide an overflow for thej material east through the top of thecasting machine and to'protect the space between the rotor andthe stator against intrusion of overflow metal.

Further purposes will appear in the speci-' fication and in the claims thereof.

I have preferred to illustrate my invention by but one form thereof, selecting a form .which 1s pract1cal,etficient and thoroughly reliable and which at the same time well illustrates the principles of my invention.

Figure 1 1s a brokenv vertical longitudinal section througha casting machine embodying my invention.

Fig. l is a detail side elevation-of part of F 1g.- 1.

Fig. 2'is a section of Fig. 1 upon line 2-2.-

Figs. 3 and 4 are broken sections, partly in elevation, asin Fig. 1, showing parts in slightly altered positions.

Fig. 3 is'a detail of the shaft head shownin Figs. 1 and 3 and partly broken away.

-, Fig. 4B is a detail side elevation of part of 1 Fig. 4.

F 5 is a broken section corresponding reference indicate strictin'g to it Taking up the description of the particular'form selected, and explaining it in illustration and not in limitation '75 to F 1g. 3, but showing the stator for the-- Upon arbase 9 any suitable standard 10,

shown here as comprising a number of pillars 10, carries at the upper'end a. stator 11'. and the cover 12. At the center of the cover a ouring funnel 13 is located.

he stator comprises one. element of an I electric motor-pair and may form the field or armature with equal suitability. In order to accommodate the laminated iron" plates 14, forming the cores 15 about which the windings 16 of the stator are wrapped, the bore 17 of the stator is counterbored at 18,:and aremovableannular cap 19 is provided so that both the plates and the wind ,ings inclosing them can be inserted from the top. .The stator is open at the center at. 20 and is provided with a base 21 and a-flange h v .Withinhis stator, which for convenience of description I will regard, as the field, is 'mounted .a rotor comprising a cylindrical shell 23, having a lini .24, which-formsthe body of the mold. T e shell is shown as flanged at 25, 'to provide upon its'under'surface a bearing or the balls 26, the .lower part of who'se'race is formed in a bearing annulus 27, restin upon or within the statorglso thatthe be 1 bearingswill be capable of sup rting the rotor. The flange forms t elower limit of an annular groove 28, whose upper limit is 'formed by the outwardly 'ex'tendin'gflange 29 of the lining 24, 25 which flange is extended at 30 to cover andprotect the space 31 betweenthe rotor and A stator so that any metal overflowing throu h the top of the rotor, as. hereinafter 5escribed, will flow; across the surface 32 of so the rotor upon the surface 33 of the stator a'nddown into'the space 34 between the stator and the casingor cover 12'. From this space, outlet, is provided through openin 8-35; 35' ithin-the annular space, 28, I prefer to provide separateheeting and armature coils, thou h I recognize that't'he armature coil could be'utilize'd for both functions. I believe that it is better to se arate the-coils 40 in o'sitien aswell. as in the un ction.

t-' is more convenient to place these coils atthe up er end of therotor and the heat from the heating coil is most needed atthis point to maintain uniform temperature throughout the mold. 'QThe-heat' coil 36 is, of course, next to 'theshell and ma be connected with its l source of current t rough the conductors 37,-

bands 38, brushes 39, switch S and'ariy suitable. exterior connections. Clhe heating coil f-J-36 is separated from thearmature 0011s by a ring 40, upon which the laminated iron armature plates 41 and conductors 42 are' mounted. These armature conductors may 'be short-circuited to advantage. This is intended to represent aconventional t eonly, and applicant believes himself entitled to cover electromagnetic rotation of the mold Iand electric heating thereof broadly It willbe noted that the field windings 16. are located 'ver'y slightl higher than the armature winding 42. 'lhie purpose of this isfto slightly lift the rotor when the current is on, so as'to partly if not wholly relieve 85 the'bearings from weight-and consequently minimum thickness of the completed casting comprising the mold.

from; friction. An suitable bearings 43 may be inserted at t e side to receive lateral thrust during rotation, ,but my experience has been that the armature is self-centering and therefore requiresno such bearing.

The lining 24, the body of the mold, is changed for different sizes and shapes of casting. Its upper end is internally flanged at.

24' to a radial depth corresponding with the and'all metalfpoured beyond the quantity required for this thickness of casting, overflows as previously indicated. l

I make the end of the mold removable; and when the axis is vertical, this end becomes the bottom of the mold." The'bottom 44 for the lining 24 thus becomes the bottom for the mold. This vertical arrangement, with vertical movement of the bottom, permits the casting to. be-droppedout, with the 86 droppin ,of the bottom, or at least the removalo thecastin' is assisted by gravity. 1

In the position s own in Fig. 1, the bot-, tomis closed against-the moldbody, with the chamfered upper surface 45 of the bot tom .in engagement with the ,chamfered lower edge 46 of the mold body24, in which position the centrifugal casting machine is I ready to receive a charge; I

The bottom 44 is shown as moved vertically by conventional means in'the form of a supporting shaft 47 and a'lever-48, 'foot-' pressed through a pedal not shown, so that it may'occupy any position between that shown infull in Fig. 1 and the dotted position in that figure. The distance between is V in excess of the height of the intended :casting, so that the casting can be removed freely through the'bottom of the lining 24 The mold bottom 44 is rotatably supported upon the top of-the shaft 47 by meansof bearings 49, 49 engaging on opposite 'sides of a cap plate 50'and against the'inte- 'rior surfaces ofthe plates 51 and 52 of the bottom. The cap plate is given'slight vertical play upon shaft 47 while rotation upon it maybe prevented, if-desired, by a key 53 fitting into a slot 54, in length exceeding the key length. This construction 'conven- 1'15 tionally provides vertical movement of the cap 50ewith respect to the shaft and rotary.- movement between the bottomv44 and the 'The up r plate 51 and a lower, plate 52 are unite through flanges 55 and 56. The former, is annularly grooved to receive arma- I t'ure plates 57 and windings58 to make the bottom in its entirety act as an armature are carried b but in Figs. 5 and 6 are vertically stationary.

'- The yoke is prevented from rotation in each case by engagement of the ears 68, 68' within slots 69 of the supports. In Figs. 1 and 3 the entire shaft 47, head 50, yoke carrying the "field windings and mold bottom carrying the armature for these windings may be lifted and lowered as a unit through the pedal lever; but in Figs. 5 and 6 the field is fixed, the ears 68 resting upon shoulders 70.

The armature of the mold bottom can be rotated by current in either of the field windings 59 or 60, or by both together. The

lower 60, is intended to provide the'initial rotation and the upper one, 59, is intended to continue the rotation and at the same time lift the mold the short distance between the positions shown in Fig. 3 and in Fig. 1,

I p when the mold bottom has reached the speed of the mold and it is desired to close the bottom against the mold.

The lever 48 carries contacts/71, 7 2, 73, to which the conductors 61, 62 and 63, respectively, are connected, and contacts 71-, .72,

73 with which the conductors 61, 62, 63

resipectively, are connected.

= t will be noted the l have again shown.

two-phasethree Wire connections, corresponding to Fig. 13, preferringthese because they simplify the illustration and reduce the number of wires and the number of con of the lever l8, which lever is pivoted at '75 upon a fixed member andis extended beyond the lever at 76. This edal endof the I lever passes through a '55 The contacts upon arm 74 tacts in each set u on arm 48 and switch ea, but ,IBCOgIIiZiHg' t at the usual connection keeps the phases separate as in Fig. 14:.

This can be used with four wires and four contacts per set.

v .All of these contacts lie upon the end .74

i e 77 having an offset and shoulder at 78,'between the two parts 79and 79 of its path." are shown at the lowermost osition of the arm in Figs. 1 (dotted) and 1 0 as? all engaging. a plate 80 short-circuitin the fields 59 and 60.

As the arm- 74 1s raised the contacts upon it pass from the plate 80, and, during the further progress at the arm, engage fixed contacts'upon the switch board 64 to successively energize thefields 60 and 59. The

fixed contacts 81, 82, 83 are connected with the terminals of a transformer T. so as tosupply two-phase current to the field 60, energizing it and causing rotation of the rotor bottom through it, but. without lifting effort. This position, shown in Fig. 4, may conveniently coincide with the engagement of arm 76 with the shoulder 78, so as to provide a mechanically-interposed dwell due to shoulder 78 at this point while the bottom is being'speeded up electrically.

As the pedal is pushed to the left in Fig.

1 toflrelease its arm'76 from the shoulder 78 and is then pressed further to press this arm down ,in the part 79' of the guide, the arm 74 of lever 48 is lifted further to disconnect the movable contacts 71, 72, 73 from the fixed contacts 81, 82, 83 and to bring the movablecontacts 71, 72, 73, into engagement with other fixed contacts 81', 82', 83'

which are also energized from the twophase transformer T.

This movement deenergizes the field 60 i and energizes the field 59, bringing the parts to the position seen in Fig. 3. The

field 59 also tends to rotate the bottom, but,

being higher than the armature part of the bottom, at the same time immediately tends to lift the bottom and consequently lifts it into the position seen in Fig. 1 against the mold.

It will be obvious that one field could be used for the bottom, instead of the two shown, particularly if it be locatedfhigh so that it would tendto lift all the time, the final mechanical lifting movement then bringing the rotating bottom, already raised 'by the field, into engagement with the mold and the electromagnetic force which holds the bottom high being effective to hold the bottom resiliently against the mold. It willcbe. further evident that the field-- single or double-could be used merely to rotate the bottom, the lifting into contact being wholly mechanical; and. that the dwell provided mechanically by the shoulder 78 can be provided in other ways by. or merely by the care.

other constructions of the operator. u I v In operation, starting with the parts as in Fig. 1, the mold is heated by the coil 36 through, any suitable application of elec I tricity, direct or alternating, through the brushes 39 and the rings 38. This heating may beso distributed as to heat the entire '"1 mold, for starting or during operation, or preferably only at the top of the mold to keep the upper and more exposed part of the mold up to temperature, and maintain uniform temperature throughout, preventing undue chilling by reason-of the high rate of speed attained.

The current is turned into field 16 to rotate its armature and hence the mold exclusive of the bottom. The bottom may be lift-the rotor bottom into gagement with the rotor bo y.

he parts are now in position for casting.

A charge is inserted through the. funnel top which may either be measured to size or. may,-

the top of the mold lining an tionajl cooling.

thrust to osition of Fig.- 3 and as to 'tpllace as in Fig. 1, by energization .of 'the old .59, either before the rotor has been .speeded up. or subsequently thereto. If

5 afterward the rotor bottom should, be speeded u v themold efore ener 'zationof fiel 59- (as to approximately the old 60) is utilized-to distinguished from o'sition in. on-

be adjusted .by overflow. of an; exces'sover the outlets 35. As soon as this casting has had sufiicient time to set and cool which means almost immediately, the rotor bottom is, lowered, Iffor any reason thecasting is not suificiently contracted tofdrop, opengives opportunity for addiing'-'the bottom f the casting has'been'sufliciently cooled beforethebottom'has been lowered, the casting lowers with the bottom and the entire bottom along with the yoke and the fieldcarried by it may be lowered to the dotted position in Fig. 1, givin room for removal of the casting. As the ottom" out through] rhea-9m .need not be raised and lowered with it,'but may be stationary and the rotor bottom'be brought within their zone by its vertical -movement alone; also that many otherfeatures maybe varied to meet the of the individual designer; I

In Figs. 5 and'6 the construction is varied in several particulars from that of Fi ,1-4.. A

Two fields 59 and 60 are shown for t e bottom of the casin viewed as an armature, but the fields are xed instead of being carried by the'yoke 65. At the. bottom of the plunger position, the'contacts. upon-arm 48 preferences do not engage with a short-circuiting plate 74 because the fields remainin theirpositions and ,,short-circuiting these fields would not hate the same effect upon the armature in its flowered position. It would still afiect the casting, viewedv as-an armature, as is true to a less extent in Fi 1-4.

As the vbottoma rinature), moves upshown in Fig. 5, the movable contacts 71', 72', 73 engage the contacts 81', 82', 83' and energize. the lower field, 60, starting rota wardly and; comes to nearly the POSltlOIl' tion of-the armature. As in Figs. 1-4 this preferably corresponds with a mechanical dwell in the movement of lever 48, for 'ex'-.

-' A drops the short-circuiting of the fields.- (Figs. 30' 1, 3 and 10) or the momentary reversal of.

I the fields as in Fig. 12 guickly stops the 1'0 tation of the bottom an of any casting car-- --ried by it.

I recognize-that mechanical brakes would 35 be effective to stop the rotation of the hotai't, best exemplified-b I of the motor parts; a so that the automatic -mechanism for making the various connecs "tom but prefer the electrical brakes described because of their greater simplicity. in application. A I 1 I 'In the meantime, the rotor isretained at 4G speed, vIn the connectionsfshownrthe ener- .gization' of the field,16 is'constant. As soon as. thecastin'g has been -removed,the pedaloperatedlift is applied, lifting the bottom to the position Fig 4- just \below that ,45 shown 1Ir Fig. 3, .withqthe pedal arm 77 resting upon shoulder .78. Current is here supplled to the field 60' bring the-bottom up to speed and subsequently, with further lifting by. the. field 59, to lift the rotor bot 50 tom'into engagement with, the rotating rotor body, ready for repeating the operation.

It will beaevident that there is at variety in the means-for applying t e power to the'severalv rotatingparts whether me- 55 chanically or electrical] and that, where this is done electrically there is also a wide range-inv electric motorapplication to this tions' can be applied through movement of any of the :movingparts; also that the elec- Y trical connections can beinade separately by hand instead of by automatic means; also ma ngthe'rotor one with the. fixed contacts 81, 82 and 83, ener,

gizing the field 59.

In the position shown in Fig. 6, the rotor I bottom is at'the height to which it would-- be raised mechanically by the p1unger ;47

but as soon as the field '59 is energized, the

bottom is raised electromagnetically into oloseen'gagement with the linm 24 forming the body of the mold. .The fi xe contacts for f v the preferred form'- of Figs. 1-4 are shown inFlg. 10with diagrammatic connections to" the transformer, intended (except as they are'three-wire for simplicity, where the man-- ufactured motors se arate the, phases and hence use four wires to be typical of connections by which the fields 59 and 60 can be energized for induction motor operation or short-circuited'.

In Fig, 11' the connections are shown di a- I grammatically, as preferred,'for the structure seen in Figs.'5 and 6,

the short-circuitplate being omitted.

' in Fig. 12,9. series of field-reversing contacts s1 82?, 83 81 s2 83 is' shown adapted to be used with a construction-hav- 1'25 ing fields 59 and 60 movable asinTFigs. 1-4,

and which contacts are engaged b the moyablelcontacts 71,72,755, 71'', 72, 3 on the I downward movementof the rotor bottom, 66 thatthe field, or fields for the rotor bottom shortly below the position of the armaturele'o' seen in Fig. 4. In this position, the contacts are reversed, as compared with the contacts above, so'as to tend to reverse the direction of rotation of the bottom (armature) and act as a brake in order that the operator may allow the armature to dwell atthis point just long enough for its addi= tional braking action to stop the rotation of the armature or of the casting, viewed as an armature, or both and may then drop the bottom; but that on-the upward movement of the armature it may be moved past this point too rapidly for appreciable effect of the reversed fields upon the armature. V

If these extra reversing contacts be placed near enough the other contacts, the reversal V will have more effect in Figs. 5 and 6, upon fields shown, The onl the bottom (as distinguished from the casting) as the 'fieldfi60 would then be nearenough to the mold armature at the time of reversal for the reversal inits coils to have a corresponding increased braking efiect upon the armature. y In 13, I have shown conventional two-phase, three-wire connections for the field coils, applicable to any of the three reason for using the three-wire instead 0 the four-wire. form is to reduce the complication'in the illustration caused by the additional wiriii In Fig. '14 the conventionahtwophase, "Io connections for the fields are shown, from transformer T such as would more'pr'obably be used, keeping the-phases A and 13 separate. In this, as in many of the other features shown, it will be obvious that the preference of the desi er and the circumstances of the indivi ual' installation will control.

" are wholly independent of the presence or I the ,novelt It-will be noted that many, of the claims absence of electricity as a motive power,

calling for arotor which maybe me-.

7 chanical, fluid or electrical, but that some of the claims bring in additional structure definin the rotor as of electricaljorm pre- 'ferre 1) me because of greater ease of ap licat on and the elasticity of the drive.

-ters Patent is:

aving thus described my inventiom wha t I claim a'snew and 'desire'to secure by Let- 1. In the method of centrifugal casting with a mold formed in two parts,'.a body i and a separable end, the novelt whichoo'nis r avit .sists inpouring the casting wit the end in position, so aratiiig the end from the mold,

I removin t e casting while'maint'ainmg'rov tation o the body of the mold and replacing the end to preparefor another casting.

2. In the method according to-claim 1, the novelty which consists in making the axis of rotation vertical so that the end becomes the bottom and the casting may be dropped from the body whollyv orv partially by the mold u .3. In the method according to claim 2, the

novelty which consists in ceasing to rotate the end when the casting is to be removed.

4. In the method'according toclaim 2 the novelty which consists in equalizing the temperature of the mold b heating the upper part of' the mold arti cially during the time that the mold is being rotated.

5 'In the method according to claim 1 the novelty which consists in rotating the mold or the bottom or bothby coaxial electromagnetic stress. a

6. In the method according to claim 2, the

novelty which consists in rotating the mold.

or the bottom or both by coaxial electromagnetic stress,

. 7 In the method according to claim 3, the novelty which consists in rotatin the mold or the bottom or both by coaxial electromagnetic stress.

.8. In the method according to claim 5,the novelty which consists in winding the mold as the rotor of an electric motor, surrounding it by a stator and rotating tromagnetic' stress between. i

. 9. In the method; accordingvtoclaim 6-,the

novelty which consists in winding the mold as the rotor of an electric motor, surrounding it by a stator and rotating by the electroma netic stressbetweenr 7 10. n the m thodaccording to claim 7,

by the electhe novelty which consists in winding the mold as the rotor oian electric motor, surrounding it by a stator and rotating by the electromagnetic stress between. v

11. In the method ccording to claim 3, the novelty which vonsists in providing means for bringing the end of the mold up to speed while the body of the mold is maintained in rotation.

12. In the method according to claim 7, which consists n providing means for ringing-the end of the mold up to speed while the body of the mold is mainof the mold upif'tri. speed, and then closin" the bottomof the fmold against the o the mold ready tdii i repeat the casting op; eration.

15. In the method according to claim 6,

the novelty which consists in sustaining part of the weight of the mold electromagnetically..

16. In themetl od according :to cla m 9,

of the weight of the mold electromagnetically.

17. In the method according to .claim 15,

' the novelty which consists in'utilizin'g a motor field to rotate the mold as an armature and placing the field high 'withrespect to the armature to effect the, lifting.

' 18. In the method according to claim 16,

1,0 the novelty which consists in utilizing a motor field to rotate the mold as an armature and-placing the field high wlth respect to the armature to effect the lifting.

19. In the method according to claim 13,

the novelty which consists in causing the final closing movement of the end by electromagnetic pull.

20. In'the method according to claim 14,

-the novelty which consists in causing the d final closing movement of the end by electromagnetic pull.

21. In the method according to claim 19,; the novelty which consists in surrounding the end,as an armature, by a motor field which, in an axial direction, is nearer to the body of the mold than is the end at the time this.

. final closing movement is to be efiected, and closing the endagainst the body by the axial pull of the field.

1 80 22. In the method according to claim 20,

the novelty which consists in surrounding the end, as an armature, by a motor field which, in an axial direction, is nearer to the body of the mold than is the end at the time 85 this final closing movement is to be eifected, and closing the end against the body by the axial pull of the field.

, 23. In the method according to claim 3, the novelty which consists in stopping rota- 40 tion of the mold end by electromagnetic stress after the end has been separatedfrom the mold. z l

24. In the method according to claim 7, the nov'eltywhich consists in stopping rotation of the mold end by electromagnetic:

stress afterthe end hasxbeen separatedfrom the mold. 25. In the method according to claim 13, the novelty which consists in stopping rotation of the mold end by electromagnetic stress after the end, has been separated from *the mold.

' 26. In the method according to claim 14, the novelty, which oonsists'in stopping rotation of the mold end by electromagnetic stress-after the end hasbeen separated from the mold. g

27. In the method'according to claim 23, the novelty which consistsin. subjecting the ,60 mold end, as an armature, to the influence of a motor field and short-circuiting or reversing the field.

' 28. In the method according to claim 24,

the novelty which consists in subjecting the as mold end as an armature, to the influence .tion with a'bottom rotatable at desired interof a motor field and short circuiting or reversing the field.

29. In the-method according to claim 25, the novelty which consists in subjecting the mold end as an armature, to the influence of a motorfield and short circuiting or reversing the field. I Y

30;. In the method accordingto claim 26, the novelty which consists in subjecting the mold end as an armature, to the influence of a motor field and short circuiting or reversing the field.

31. In a centrifugal casting machine, a rotor mold, an electric armature, and bearings for the armature sup orting it, in com bination with a field for t e armature, electromagnetically centered above the electromagnetic center of-the armature and tending to lift the armature With respect to its bearings'. I

32. Ina centrifugal casting machine, a rotor having a vertical axis and carrying a mold, bearings therefor upon which the rotor is adapted to rest and electromagnetic means for rotating the rotor and for tending to lift the weight of the rotor from the bearings.

33. In a centrifugal casting machine, a rotor carryinge mold open at one end, a closure for the end, means for rotating the mold and se arate means for rotating the closure, permitting it to be stopped when desired while the mold is being rotated.

34-. In a centrifugal casting machine, a rotor anda mold carried thereby, having an open end in combination with a closure for the end, (means for moving the closure into and out of contact with the mold, means for rotating the mold and separate means for rotating the closure, permitting it to be stopped when' desired while the mold is be- 'ing rotated.

'bottom upon which the bottom is rotatable and axially movable, means for moving the bottom 1nto proximity to its closing posit1on and electromagnetic means for lifting the moldbottom into final engagement with the mold.

37. A centrifugal casting machine having 'a continuously rotating rotor with a vertical axis and carrying a mold, in combinavals, movable from the said rotor for withdrawal of the castings during the rotation of the mold, and separate means for rotating the bottom, which bottom is adapted to be stopped while the rotor is being rotated. 180

up I

38. A -centrifugal casting machine having a continuously rotating rotor witha vertical axis and carrying a mold, in combina-' desired intervals while the mold'is being rotated.

40. In a centrifugal casting machine, a vertical rotor mold having an open bottom, a removable bottom therefor adapted to be dropped while the rotation of the rotor is maintained and separate means for lifting ,the bottom close to the mold and for closing it against the mold.

41. In a centrifugal casting machine, a

rotor upon -a vertical axis carrying an openbot'tomed mold, means for turning the rotor, a movable bottom for the mold, itself comprising a rotor, a stator therefor, the rotor and stator together comprising an electric motor and current supply for. the electric motor.

42. In a centrifugal casting machine, a

rotor upon a vertical axis carrying'an 0p enbottomed mold, a bottom for the mold comprising a motor rotor and a stator adapted to turn the rotor and located high with respect to the rotor to lift the bottom into final contact with the mold.

43. In .a centrifugal casting machine, a rotor upon a vertical axis, an open-bottomed mold carried thereby and a vertically movable bottom for the mold in combination with electromagnetic means for rotating the bottom.

44. In a centrifugal casting machine, a rotor having a vertical a'xis,-an open-bottomed mold carried thereby and a vertically movable bottom in combination with electromagnetic means for lifting the bottom. I

45. In a centrifugal casting machine, a rotor having a vertical axis, an open-bottomed mold carried thereby and a vertically movable bottom in combination with electromagnetic means for lifting and rotating the bottom.

46. In a centrifugal casting machine, a rotor upon a vertical axis, an open-bottomed mold carried thereby and a vertically movable bottom comprising a motor armature in combination with two fields for the armature both adapted to rotate the armature and one adapted to lift it.

47. In a centrifugal casting machine, a centrifugal rotor, in combination with an electric stator for turning the rotor, a bottom for the rotor comprising an element of an electric motor and a separate stator for the bottom of the rotor.

' 48. In a centrifugal casting machine, a rotor upon a vertical axis, an open-bottomed mold carried thereby, a vertically movable bottom for the mold, forming a motor armature,'a support therefor upon which the bottom is adapted to rotate, means for. lifting and lowering the bottom and a field for the bottom carried by the support and adapted to be lifted and lowered with it.

49. In a centrifugal casting machine, a rotor upon a vertical axis, an open-bottomed mold. carriedthereby, a vertically movable bottom for the mold, forming a motor armature, a support therefor upon which the bottom is adapted to rotate, means for lifting and lowering the bottom, a field for the bottom carried by the support and adapted to be lifted and lowered with it and automatic means for energizing the field when the bottom reaches a predetermined height.

50. In a centrifugal casting machine, a rotor upon a vertical axis, an open-bottomed mold carried thereby, a vertically movable bottom for the mold, forming 'a motor armature, a support therefor upon which the bottom is adapted to rotate, means for lifting and lowering the bottom, a field for the bottom carried by the support and adapted to be lifted and lowered with it and automatic means for short-circuiting the field as it is lowered.

51'. Ina centrifugal casting machine, a rotor upon a vertical axis, an open-bottomed mold carried thereby, a vertically movable .bottom for the mold, forming a motor armature, a support therefor upon which the bottom is adapted to rotate, means for lifting and lowering the bottom, a field for the bottom carried by the support and adapted to be lifted and lowered with it and automatic means for energizing the field as it moves up and for short-circuiting it as it moves down. 52. In a centrifugal casting machine, a rotor upon a vertical. axis, an open-bottomed. mold carried thereby, a vertically movable bottom for the mold, a support therefor upon. which the bottom is adapted to rotate, means for lifting and lowering the bottom, the bottom forming a motor armature and field mechanism a plicable to the armature, mounted upon the support, movable with the armature, adapted to rotate it and adapted to lift it relatively to the su port.

n a centrlfugal casting machine, a

rotor upon a vertical axis, an open-bottomed mechanism applicable to the armature,

L" and lifting field mechanism-successively as,

mounted upon the support, movable'with the armature, adapted to rotate itan d adapt ed to lift it relatively to the support and auomatic means for connecting the rotating the bottom is lifted. I 54. In a centrifugal casting rotor upon a vertical axis, an open-bottomed mold carried thereb a vertically movable bottom for the mo d, a support therefor upon which the bottom is adapted to rotate,

'means for lifting and. lowering the bottom,

" the bottom forming a motorarmature, field mechanism applicable to the armature,

mounted upon the support, movable withthe armature, adapted to rotate it and adapt'-' ed to lift it relatively to the support and aurotationbefore omatic means for connecting the rotating and liftingfield mechanism successively as the bottom is 'lifted;-provid ing a pause for the} lifting function is applied.

55. Ina centrifugal casting machine, .a rotof upon a vertical 'axisyan open-bot-- 'tomed mold carried thereby, a vertically .movable bottom for the mold, a support therefor upon which the'bottom is adapted K to rotate, meansfor lifting and lowering the bottom, the bottom formlng a motor arma-I.

ture, field mechanism a plicable to the arms-- ture, mounted upon t e support, movable with the armature, adapted to rotate it and adapted to lift itzrel'atively. to the support and automatic means for short circuiting the field mechanism at lower levels and causing -it to successively rotate and lift the armatu're at higher levels.

.56. In a ,centrifugal'casting machine, a

machine, a.

' rotor having rotor havin a. vertical axis and comprising part of an e ectric motor, a mold carried by the rotor, astator comprlsing the other motor element, a maintained supply of current for the stator, a vertically movable bottom V for; the mold comprising a second rotor for an electric motor andan automatically made and broken electric supplyffor revolving the bottom. x

57.1 In a centrifu a1 casting machine, a rotor carryi a moFd and havlng a vertical axis, a separa 1e bottom for the mold, a support for the bottom upon whichit has ro-' tatable and axial movement, electromagnetic "means for rotating the bottomand electromagnetic meansfor lifting it ,mto final engagement with \themold.

58. In a centrifugal casting machine, a

a field for said; armature.

. '59. In a centrifugal casting machine, a- I rotor having 'a vertical axis and carig inga mold, a-stator therefor, the stator .an I rotor together forming an electric motor for rodivisibn line. HAROLD G. EYNON. p

rotor carrying amold, a heating coil sur- 1 rounding the mold,- an armature winding -outside of the coil and a stator effect ve as .by' the rotor bridging {the division linebev tween the rotor and stator to carry. the over- I fio'w beyond said 

